Carburetor



. A. G. REDMOND v CARBURET OR Filedv May 3l. 1921 2 Sn'eets-Sheet 2 Lmnmmw L; gllillllllllllilillll` 25 "nmw g linnn iii III 9? 2g 'mw-l 1 i 6 1 "i u f 11 f a SHN Qi. Y a

E Y' r LAS76' v @mm1/1to1 l Patented Nov. 2 3, 1926.

UNITED STATES ALBERT G. REDMOND, F INDIANAPOLIS,

PATENT OFFICE.

INDIANA, ASSIGNOR TO MARVEL CARBU- RETER COMPANY, OFILINT, MICHIGAN, A CORPORATION OF INDIANA.

CARBURETOR.

Application led May 31,

This invention relates to certain new and useful improvements in carburetors, and has for its object the provision of a carburetor which is exceedingly simple and cheap in construction and one in which a main fuel nozzle is employed and a high speed nozzle, said high speed nozzle being arranged adjacent the pivoted valve which is adapted to be opened by the suction of the engine when the speed of the engine is increased.`

Another object of the invention is to provide a carburetor in which the main fuel nozzle is located centrally within the opening formed in a horizontally disposed partition so as to allow the air' to pass all around the Valve to take up the gasoline or fuel.

Another object of the invention is to provide a dash pot arrangement' for retarding the opening movement of the pivoted valve.

Other and further objects and vadvantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In thedrawings- Figure 1 is a longitudinal section through my improved construction of carburetor;

Figure 2 is a section taken on the line 2-2 of Figure l; f

Figure 3 is a section ,taken on the line 3-3 of Figure 2; and

Figure 4 is a section taken on the line 4-4 of Figure 2.

Like numerals of reference refer to like parts in the several figures of the drawings.

In carrying out my improved construction of carb'uretor, I employ a tubular shell havinga bowl portion 1 forming a fuel and float chamber 2 and provided with an air chamber 3 and a mixing chamber 4.

The shell also has formed integral therewith, a dash 'pot chamber 5 as clearly shown in Figs. 2, 3 and 4, which is provided with a.

ort 5 communicating with the fuel cham- The shell 1 is provided with an integral easing 6 having a horizontally disposed partitionv 7 forming a b -pass 8 communicating with the air cham er 3 and an outlet 9, communicating with the mixing cham- 50 ber 4.

The partition is provided with an opening 10 through which extends centrallya main fuel nozzle 11 mounted in the bottom of the casing having a depending portion 12 1921. Serial No. 473,700.

, extending into the bowl, as clearly shown in extended position soas to cooperate with the grooved portion of the hub of the crank, as clearly shown in Figf 1.

1n the construction so far described, air enters the air inlet 13 passes through the by-pass 8 around the mainfuel nozzle 11,

. and draws the fueltherefrom which passes out through the port 9 into the mixing chamber 4.

Arranged above the mixing chamber is a casting 21 forming a throttle valve chamber 22 provided with a throttle valve 23 having a collarifor securing the same Vto the ordinary manifold of an engine, said casting being secured to the shell by a bolt 23.

'lhe bowl 1 and dash pot chamber, are closed by a cover 24 secured in position by bolts 25 and is provided with a fuel inlet 26 to which a fuel supply pipe 27 is connected, said fuel inlet having a valve seat 28 adapted to receive av sliding valve 29 mounted upon a substantially horseshoe-Shaped float 30 which is pivotally mounted atv 32 to a depending lug of the cover` 24 by means of which, the fuel within the bowl is maintained at a constant level.l

The casing 6 is provided with an opening in its top in which is mounted a screw plug 33y having a threaded bore 34 in which is mounted a threaded portion 35 of a needle valve 36 extending into the fuel nozzle 11 controlling the passage offuel therethrough, said needle valve extending through an apertured boss formed in the cover and having ahead 37 for externally operating the same.

Extending from the bottom of the bowl into the air chamber 3 is a high speed nozzle 38 which terminates adjacent the o posite wall of the air chamber and over w ich is arranged a pivotally mounted valve 39 for normally closing the air chamber, said valve being adjustably mounted on a valve stem 40 and is provided with weights 4l for normally holding the same in closed position. It will be seen that by arranging the valvev in this manner, as the speed of the engine is increased, the suction is increased so as to swing the valve on its pivot and the sudden rush of air past the high speed nozzle draws the fuel therefrom so as to enrich the mixture.

`Adjustably mounted on one end of the valve stem 40 is a crank 41 which is secured in adjusted position by a thumb nut 42 said crank being pivotally connected to a piston rod 43 carried by a piston head 44 mounted within the dash pot chamber 5 so as to retard the opening movement of the pivoted valve 39 as it will be seen that in the upward movement of the pivoted valve, the valve stem 40 is rocked upon its pivot so as to depress the piston within the dash pot chamber in order to exert a resistance thereto by the displacement of fuel therein.

1n order to adjust the resistance exerted against the opening movement of the high speed valve, l arrange a coil spring 45 within the dash vpot chamber having its lower end mounted on a head 46 carried by an adjusting nut 47. By this construction, by adjusting the position of the spring in respect to the piston head, the resistance can be increased or decreased so as to regulate the opening movement of the .high speed valve.

In the operation of a carburetor as shown and described when attached tovan engine which is running at low speed, air is taken in through the inlet passage through the air chamber and the by-pass around-the fuel nozzle 1l so as to suck the necessary amount of fuel therefrom and passes outthrough the outlet port 9 into the mixing chamber and is conveyed through the throttlechamber to the manifold of the engine. As the speed of the engine is increased, the suction is increased so as to overcome the resistance to the opening movement of the high speed valve 39 causing the same to swing upon its pivot and allow it to pass from the air chamber directly into the mixing chamberl which sucks fuel therefrom so as to enrich the mixture.

l claim:

1. Acarburetor comprising a shell having endl of said valve to provide a tail portion arranged between the inlet and outlet of said by-pass to control the air flow therethrough and a fuel nozzle arranged adjacent the free end of said valve.

2. A carburetor comprising a shell having an unobstructed passage extending therethrough, a fuel chamber, a casing arranged within the fuel chamber, a vertically disposed nozzle extending from said fuel chamber into said casing, a pivoted suction controlled valve extending entirely across said unobstructed passage and forming a mixing chamber above said valve and an air chamber below saidy valve, said casing having apartition forming a by-pass having an inlet extending from said air chamber to said fuel nozzle and an outlet extendin from said fuel nozzle to said mixing cham er said suction controlled valve having a counter-balancing tail portion extending to a point adjacent the partition between the inlet and outlet of said by-pass to control the air flow therethrough and a high speed nozzle extending from said fuel chamber and terminating adjacent the free end of said suc-l tion controlled valve. i

3. A carburetor comprising a shell having an unobstructed passage extending therethrough, a fuel and oat chamber, a suction controlled valve mounted on a pivot intermediate its ends in said passage for completely closing said passage, said valve forming in said passage a mixing chamber and an airchamber, a high speed nozzle extending diagonally from said fuel chamber into said air chamber and terminating adjacent the free end of said suction controlled valve, a casing formed in said shell and extending into said fuel chamber forming a by-pass extending from said air chamber to said mixing chamber, arlow speed nozzle disposed in said casing, one end of said valve being arranged between the inlet and outlet of said by-pass to control the air dow therethrough,l said by-pass having its outlet extending into said mixing chamber.

4. A carburetor comprising a shell and a fuel chamber, said shell having an inlet passage extending therethrough, a pivoted suction controlled valve extending across said unobstructed passage, said valve being mounted intermediate its endsto providea tail portion adapted to move in anopposite direction to the movement of air in its passage through said passage, a casing disposed in said fuel chamber having an inlet passage communicating with said unobstructed passage below said valve and with said passage above said valve, the tail portion of said valve being arranged between the inlet and outlet of the by-pass to control the air flow therethrough, a low speed nozzle extending into said casing and a high speed nozzle extending from said fuel chamber and terminating adjacent the free end of said suction controlled valve.

5. A carburetor comprising a shell and a fue] chamber, said shell having anl unobstructed passage extending therethrough, a valve mounted in said passage for entirely closing said passage and having a tail portion adapted to move in the opposite direction of air passing through said passage, a by-pass for delivering an explosive mixture from said fuel chamber to said unobstructed passage above said valve, the tail portion of said'l valve being arranged between the inlet and outlet of said by-pass tov control the air ow therethrough and a nozzle extending from said fuel chamber and terminating adjacent the free end of said suction controlled valve.

In testimony whereof I hereunto aix my signature.

ALBERT G. REDMOND. 

